背景：
我们在一些恢复测试案例中，会经常遇到一些奇怪的问题，其中有的是源端数据文件不规范而导致恢复过程出错，比较常见的错误有：
- 数据文件名称重复（如：/oradata1/user01.dbf 和 /oradata2/user01.dbf），这种情况下，我们在做恢复测试时候，如果往同一块盘中恢复数据文件，就会报错，需要我们重新rename 重名的datafile。
- 数据文件状态为recover，非online，通常发生在客户使用RAC环境，增加数据文件时候，错误的将datafile加到了本地磁盘，而发现错误后，又执行了offline datafile操作。
本文，主要测试，在数据库中，含有recover 状态的数据文件，如果做rman恢复测试？
1.创建测试表空间
SQL> CREATE TABLESPACE test DATAFILE '/u01/app/oracle/oradata/TEST/test01.dbf' size 10M autoextend on EXTENT MANAGEMENT LOCAL;
Tablespace created.
SQL> alter tablespace test add datafile '/u01/app/oracle/oradata/TEST/test02.dbf' size 10M;
Tablespace altered.
2.在测试表空间中创建表
SQL> create table scott.test1 tablespace test as select * from dba_objects;
Table created.
SQL> select count(*) from scott.test1 ;
COUNT(*)
----------
78918
3.模拟offline datafile
3.1 执行offline datafile
SQL> set line222
SQL> col name for a80
SQL> select file#,name,status from v$datafile;
FILE# NAME STATUS
---------- -------------------------------------------------------------------------------- --------------
1 /u01/app/oracle/oradata/TEST/system01.dbf SYSTEM
2 /u01/app/oracle/oradata/TEST/sysaux01.dbf ONLINE
3 /u01/app/oracle/oradata/TEST/undotbs01.dbf ONLINE
4 /u01/app/oracle/oradata/TEST/users01.dbf ONLINE
5 /u01/app/oracle/oradata/TEST/example01.dbf ONLINE
6 /u01/app/oracle/oradata/TEST/test01.dbf ONLINE
7 /u01/app/oracle/oradata/TEST/test02.dbf ONLINE
SQL> alter database datafile 7 offline;
Database altered.
SQL> select file#,name,status from v$datafile;
FILE# NAME STATUS
---------- -------------------------------------------------------------------------------- --------------
1 /u01/app/oracle/oradata/TEST/system01.dbf SYSTEM
2 /u01/app/oracle/oradata/TEST/sysaux01.dbf ONLINE
3 /u01/app/oracle/oradata/TEST/undotbs01.dbf ONLINE
4 /u01/app/oracle/oradata/TEST/users01.dbf ONLINE
5 /u01/app/oracle/oradata/TEST/example01.dbf ONLINE
6 /u01/app/oracle/oradata/TEST/test01.dbf ONLINE
7 /u01/app/oracle/oradata/TEST/test02.dbf RECOVER
7 rows selected.
此时，我们可以看到datafile 7 的状态已经变为recover。
3.2 再次查询，报错
SQL> select count(*) from scott.test1 ;
select count(*) from scott.test1
*
ERROR at line 1:
ORA-00376: file 7 cannot be read at this time
ORA-01110: data file 7: '/u01/app/oracle/oradata/TEST/test02.dbf'
3.3 继续创建测试表
SQL> create table scott.test2 tablespace test as select * from dba_objects;
Table created.
SQL> select count(*) from scott.test2 ;
COUNT(*)
----------
78919
3.4 手动删除归档日志
SQL> alter system switch logfile ;
System altered.
SQL> /
System altered.
SQL> alter system checkpoint;
System altered.
-- 手动删除归档日志
[oracle@ora11204 ~]$ rm -rf 1_*
3.5 继续插入数据，切换日志
SQL> insert into scott.test2 select * from dba_objects;
78919 rows created.
SQL> select count(*) from scott.test2 ;
COUNT(*)
----------
157838
SQL> alter system switch logfile ;
System altered.
SQL> /
System altered.
SQL> alter system checkpoint;
System altered.
结论：虽然datafile 7 的状态变成了recover ，但是受影响的只是原来的表test1，而新表test2不受影响，可以继续写入。 其实也就是说，如果offline的datafile中不含有对象，那么对数据的使用，没有影响。
3.6 尝试recover datafile 7
SQL> recover datafile 7;
ORA-00279: change 4592370 generated at 07/09/2022 12:38:37 needed for thread 1
ORA-00289: suggestion : /home/oracle/1_37_1104664055.dbf
ORA-00280: change 4592370 for thread 1 is in sequence #37
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
AUTO
ORA-00308: cannot open archived log '/home/oracle/1_37_1104664055.dbf'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
ORA-00308: cannot open archived log '/home/oracle/1_37_1104664055.dbf'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
结论：这个时候，如果我们想去recover datafile 7，恢复正常的online状态，已经不行了，因为归档日志都已经被手动删除了。
所以正确的做法应该是： 在3.1手动执行offline datafile之后，立即做recover datafile，这样不管到什么时候，都可以online datafile，即使归档日志已经被删除。
此时我们的数据库中就包含了一个recover 状态的数据文件，那么我们接下来看，如何备份恢复？
4. 模拟备份恢复
4.1 rman备份
-- 备份前，先删掉expired archivelog
[oracle@ora11204 backup]$ rman target /
Recovery Manager: Release 11.2.0.4.0 - Production on Sat Jul 9 12:47:26 2022
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database: LHR11G (DBID=2007947551)
RMAN> crosscheck archivelog all;
RMAN> delete expired archivelog all;
Do you really want to delete the above objects (enter YES or NO)? yes
deleted archived log
archived log file name=/home/oracle/1_18_1104664055.dbf RECID=30 STAMP=1107010872
deleted archived log
archived log file name=/home/oracle/1_19_1104664055.dbf RECID=31 STAMP=1107084082
deleted archived log
archived log file name=/home/oracle/1_20_1104664055.dbf RECID=32 STAMP=1107084317
deleted archived log
archived log file name=/home/oracle/1_21_1104664055.dbf RECID=33 STAMP=1107248395
deleted archived log
archived log file name=/home/oracle/1_23_1104664055.dbf RECID=35 STAMP=1107248458
deleted archived log
archived log file name=/home/oracle/1_24_1104664055.dbf RECID=36 STAMP=1107248477
deleted archived log
archived log file name=/home/oracle/1_25_1104664055.dbf RECID=37 STAMP=1107248494
deleted archived log
archived log file name=/home/oracle/1_26_1104664055.dbf RECID=38 STAMP=1107248708
deleted archived log
archived log file name=/home/oracle/1_27_1104664055.dbf RECID=39 STAMP=1107249210
deleted archived log
archived log file name=/home/oracle/1_28_1104664055.dbf RECID=40 STAMP=1107249384
deleted archived log
archived log file name=/home/oracle/1_29_1104664055.dbf RECID=41 STAMP=1107594979
deleted archived log
archived log file name=/home/oracle/1_30_1104664055.dbf RECID=42 STAMP=1107965313
deleted archived log
archived log file name=/home/oracle/1_31_1104664055.dbf RECID=43 STAMP=1109430200
deleted archived log
archived log file name=/home/oracle/1_32_1104664055.dbf RECID=44 STAMP=1109400986
deleted archived log
archived log file name=/home/oracle/1_33_1104664055.dbf RECID=45 STAMP=1109514747
deleted archived log
archived log file name=/home/oracle/1_34_1104664055.dbf RECID=46 STAMP=1109515327
deleted archived log
archived log file name=/home/oracle/1_35_1104664055.dbf RECID=47 STAMP=1109593810
deleted archived log
archived log file name=/home/oracle/1_36_1104664055.dbf RECID=48 STAMP=1109593862
deleted archived log
archived log file name=/home/oracle/1_37_1104664055.dbf RECID=49 STAMP=1109594665
deleted archived log
archived log file name=/home/oracle/1_38_1104664055.dbf RECID=50 STAMP=1109594666
Deleted 20 EXPIRED objects
-- 正式备份
RMAN> run{
2> allocate channel c1 device type disk;
3> backup database filesperset 3 format '/home/oracle/backup/db_%d_%T_%U';
4> backup archivelog all format '/home/oracle/backup/arc_%t_%s';
5> backup current controlfile format '/home/oracle/backup/cntrl_%s_%p_%s';
6> release channel c1;
7> }
released channel: ORA_DISK_1
allocated channel: c1
channel c1: SID=33 device type=DISK
Starting backup at 2022-07-09 12:48:34
channel c1: starting full datafile backup set
channel c1: specifying datafile(s) in backup set
input datafile file number=00001 name=/u01/app/oracle/oradata/TEST/system01.dbf
channel c1: starting piece 1 at 2022-07-09 12:48:34
channel c1: finished piece 1 at 2022-07-09 12:48:41
piece handle=/home/oracle/backup/db_LHR11G_20220709_4k1264p2_1_1 tag=TAG20220709T124834 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:07
channel c1: starting full datafile backup set
channel c1: specifying datafile(s) in backup set
input datafile file number=00003 name=/u01/app/oracle/oradata/TEST/undotbs01.dbf
input datafile file number=00005 name=/u01/app/oracle/oradata/TEST/example01.dbf
input datafile file number=00007 name=/u01/app/oracle/oradata/TEST/test02.dbf
channel c1: starting piece 1 at 2022-07-09 12:48:41
channel c1: finished piece 1 at 2022-07-09 12:48:44
piece handle=/home/oracle/backup/db_LHR11G_20220709_4l1264p9_1_1 tag=TAG20220709T124834 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:03
channel c1: starting full datafile backup set
channel c1: specifying datafile(s) in backup set
input datafile file number=00002 name=/u01/app/oracle/oradata/TEST/sysaux01.dbf
input datafile file number=00004 name=/u01/app/oracle/oradata/TEST/users01.dbf
input datafile file number=00006 name=/u01/app/oracle/oradata/TEST/test01.dbf
channel c1: starting piece 1 at 2022-07-09 12:48:44
channel c1: finished piece 1 at 2022-07-09 12:48:47
piece handle=/home/oracle/backup/db_LHR11G_20220709_4m1264pc_1_1 tag=TAG20220709T124834 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:03
channel c1: starting full datafile backup set
channel c1: specifying datafile(s) in backup set
including current control file in backup set
including current SPFILE in backup set
channel c1: starting piece 1 at 2022-07-09 12:48:48
channel c1: finished piece 1 at 2022-07-09 12:48:49
piece handle=/home/oracle/backup/db_LHR11G_20220709_4n1264pf_1_1 tag=TAG20220709T124834 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:01
Finished backup at 2022-07-09 12:48:49
Starting backup at 2022-07-09 12:48:50
current log archived
channel c1: starting archived log backup set
channel c1: specifying archived log(s) in backup set
input archived log thread=1 sequence=39 RECID=51 STAMP=1109594808
input archived log thread=1 sequence=40 RECID=52 STAMP=1109594809
input archived log thread=1 sequence=41 RECID=53 STAMP=1109594930
channel c1: starting piece 1 at 2022-07-09 12:48:50
channel c1: finished piece 1 at 2022-07-09 12:48:51
piece handle=/home/oracle/backup/arc_1109594930_152 tag=TAG20220709T124850 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:01
Finished backup at 2022-07-09 12:48:51
Starting backup at 2022-07-09 12:48:51
channel c1: starting full datafile backup set
channel c1: specifying datafile(s) in backup set
including current control file in backup set
channel c1: starting piece 1 at 2022-07-09 12:48:52
channel c1: finished piece 1 at 2022-07-09 12:48:53
piece handle=/home/oracle/backup/cntrl_153_1_153 tag=TAG20220709T124851 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:01
Finished backup at 2022-07-09 12:48:53
released channel: c1
4.2. 恢复DB
利用备份做异机恢复（拷贝备份、pfile文件、密码文件等过程省略…）
4.2.1 启动数据库至nomount状态
SQL> startup nomount
ORACLE instance started.
Total System Global Area 1068937216 bytes
Fixed Size 2260088 bytes
Variable Size 331350920 bytes
Database Buffers 729808896 bytes
Redo Buffers 5517312 bytes
4.2.2 恢复控制文件
[oracle@ora11204 backup]$ rman target /
Recovery Manager: Release 11.2.0.4.0 - Production on Sat Jul 9 12:51:00 2022
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database: LHR11G (not mounted)
RMAN> restore controlfile from '/home/oracle/backup/cntrl_153_1_153';
Starting restore at 2022-07-09 12:51:01
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=19 device type=DISK
channel ORA_DISK_1: restoring control file
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
output file name=/u01/app/oracle/oradata/TEST/control01.ctl
Finished restore at 2022-07-09 12:51:03
4.2.3 mount数据库
RMAN> alter database mount;
database mounted
released channel: ORA_DISK_1
4.2.4 restore database
RMAN> restore database;
Starting restore at 2022-07-09 12:51:23
Starting implicit crosscheck backup at 2022-07-09 12:51:23
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=19 device type=DISK
Crosschecked 22 objects
Finished implicit crosscheck backup at 2022-07-09 12:51:24
Starting implicit crosscheck copy at 2022-07-09 12:51:24
using channel ORA_DISK_1
Finished implicit crosscheck copy at 2022-07-09 12:51:24
searching for all files in the recovery area
cataloging files...
no files cataloged
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00001 to /u01/app/oracle/oradata/TEST/system01.dbf
channel ORA_DISK_1: reading from backup piece /home/oracle/backup/db_LHR11G_20220709_4k1264p2_1_1
channel ORA_DISK_1: piece handle=/home/oracle/backup/db_LHR11G_20220709_4k1264p2_1_1 tag=TAG20220709T124834
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:03
channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00003 to /u01/app/oracle/oradata/TEST/undotbs01.dbf
channel ORA_DISK_1: restoring datafile 00005 to /u01/app/oracle/oradata/TEST/example01.dbf
channel ORA_DISK_1: restoring datafile 00007 to /u01/app/oracle/oradata/TEST/test02.dbf
channel ORA_DISK_1: reading from backup piece /home/oracle/backup/db_LHR11G_20220709_4l1264p9_1_1
channel ORA_DISK_1: piece handle=/home/oracle/backup/db_LHR11G_20220709_4l1264p9_1_1 tag=TAG20220709T124834
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:03
channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00002 to /u01/app/oracle/oradata/TEST/sysaux01.dbf
channel ORA_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/TEST/users01.dbf
channel ORA_DISK_1: restoring datafile 00006 to /u01/app/oracle/oradata/TEST/test01.dbf
channel ORA_DISK_1: reading from backup piece /home/oracle/backup/db_LHR11G_20220709_4m1264pc_1_1
channel ORA_DISK_1: piece handle=/home/oracle/backup/db_LHR11G_20220709_4m1264pc_1_1 tag=TAG20220709T124834
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:03
Finished restore at 2022-07-09 12:51:33
4.2.5 在RMAN中执行recover database
RMAN> recover database;
Starting recover at 2022-07-09 12:51:49
using channel ORA_DISK_1
starting media recovery
archived log for thread 1 with sequence 39 is already on disk as file /home/oracle/1_39_1104664055.dbf
archived log for thread 1 with sequence 40 is already on disk as file /home/oracle/1_40_1104664055.dbf
archived log for thread 1 with sequence 41 is already on disk as file /home/oracle/1_41_1104664055.dbf
Oracle Error:
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01152: file 1 was not restored from a sufficiently old backup
ORA-01110: data file 1: '/u01/app/oracle/oradata/TEST/system01.dbf'
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 07/09/2022 12:51:49
RMAN-06053: unable to perform media recovery because of missing log
RMAN-06025: no backup of archived log for thread 1 with sequence 38 and starting SCN of 4593111 found to restore
RMAN-06025: no backup of archived log for thread 1 with sequence 37 and starting SCN of 4591558 found to restore
结论：我们直接用传统的方式，在rman中执行recover database，会报错，需要37、38 两个已经被删除的archive log，无法完成recover。
4.2.6 在SQLPLUS中执行recover database
-- 先恢复归档全备中的归档日志
RMAN> restore archivelog from logseq 39 thread 1;
Starting restore at 2022-07-09 13:02:02
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=1 device type=DISK
channel ORA_DISK_1: starting archived log restore to default destination
channel ORA_DISK_1: restoring archived log
archived log thread=1 sequence=39
channel ORA_DISK_1: restoring archived log
archived log thread=1 sequence=40
channel ORA_DISK_1: restoring archived log
archived log thread=1 sequence=41
channel ORA_DISK_1: reading from backup piece /home/oracle/backup/arc_1109594930_152
channel ORA_DISK_1: piece handle=/home/oracle/backup/arc_1109594930_152 tag=TAG20220709T124850
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:01
Finished restore at 2022-07-09 13:02:03
-- 执行 recover database操作
SQL> recover database using backup controlfile until cancel;
ORA-00279: change 4592370 generated at 07/09/2022 12:38:37 needed for thread 1
ORA-00289: suggestion : /home/oracle/1_37_1104664055.dbf
ORA-00280: change 4592370 for thread 1 is in sequence #37
结论：我们在sqlplus中执行recover database，也会报错，需要37、38 两个已经被删除的archive log，无法完成recover。
4.3. 解决办法
4.3.1 查询数据文件状态
SQL> set line222
SQL> col name for a60
SQL> SELECT a.FILE#,a.NAME,a.RECOVER,a.CHECKPOINT_CHANGE#,status FROM v$datafile_header a;
FILE# NAME RECOVE CHECKPOINT_CHANGE# STATUS
---------- --------------------------------------------------------- ------ ------------------ -------------
1 /u01/app/oracle/oradata/TEST/system01.dbf 4593921 ONLINE
2 /u01/app/oracle/oradata/TEST/sysaux01.dbf 4593926 ONLINE
3 /u01/app/oracle/oradata/TEST/undotbs01.dbf 4593924 ONLINE
4 /u01/app/oracle/oradata/TEST/users01.dbf 4593926 ONLINE
5 /u01/app/oracle/oradata/TEST/example01.dbf 4593924 ONLINE
6 /u01/app/oracle/oradata/TEST/test01.dbf 4593926 ONLINE
7 /u01/app/oracle/oradata/TEST/test02.dbf 4592370 ONLINE
7 rows selected.
SQL> select file#,name,status from v$datafile;
FILE# NAME STATUS
---------- --------------------------------------------------------- --------------
1 /u01/app/oracle/oradata/TEST/system01.dbf SYSTEM
2 /u01/app/oracle/oradata/TEST/sysaux01.dbf ONLINE
3 /u01/app/oracle/oradata/TEST/undotbs01.dbf ONLINE
4 /u01/app/oracle/oradata/TEST/users01.dbf ONLINE
5 /u01/app/oracle/oradata/TEST/example01.dbf ONLINE
6 /u01/app/oracle/oradata/TEST/test01.dbf ONLINE
7 /u01/app/oracle/oradata/TEST/test02.dbf RECOVER
7 rows selected.
我们可以看到在v d a t a f i l e h e a d e r 视图中， d a t a f i l e 7 状态仍然为 o n l i n e , 在 v datafile_header视图中，datafile 7 状态仍然为online,在v datafileheader视图中，datafile7状态仍然为online,在vdatafile中状态为recover。
4.3.2 执行offline datafile 操作
SQL> alter database datafile 7 offline drop;
Database altered.
SQL> set line222
SQL> col name for a60
SQL> SELECT a.FILE#,a.NAME,a.RECOVER,a.CHECKPOINT_CHANGE#,status FROM v$datafile_header a;
FILE# NAME RECOVE CHECKPOINT_CHANGE# STATUS
---------- ---------------------------------------------------- ------ ------------------ --------------
1 /u01/app/oracle/oradata/TEST/system01.dbf 4593921 ONLINE
2 /u01/app/oracle/oradata/TEST/sysaux01.dbf 4593926 ONLINE
3 /u01/app/oracle/oradata/TEST/undotbs01.dbf 4593924 ONLINE
4 /u01/app/oracle/oradata/TEST/users01.dbf 4593926 ONLINE
5 /u01/app/oracle/oradata/TEST/example01.dbf 4593924 ONLINE
6 /u01/app/oracle/oradata/TEST/test01.dbf 4593926 ONLINE
7 /u01/app/oracle/oradata/TEST/test02.dbf 4592370 OFFLINE
SQL> recover database using backup controlfile until cancel;
ORA-00279: change 4593921 generated at 07/09/2022 12:48:34 needed for thread 1
ORA-00289: suggestion : /home/oracle/1_41_1104664055.dbf
ORA-00280: change 4593921 for thread 1 is in sequence #41
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
AUTO
ORA-00279: change 4593946 generated at 07/09/2022 12:48:50 needed for thread 1
ORA-00289: suggestion : /home/oracle/1_42_1104664055.dbf
ORA-00280: change 4593946 for thread 1 is in sequence #42
ORA-00278: log file '/home/oracle/1_41_1104664055.dbf' no longer needed for
this recovery
ORA-00308: cannot open archived log '/home/oracle/1_42_1104664055.dbf'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
结论：recover不在需要37、38 两个已经被删除的archive log，正常完成recover 操作。
4.3.3 查看redo logfile & tempfile
-- 确保redo logfile & tempfile路径存在或者rename file
SQL> select member from v$logfile;
MEMBER
------------------------------------------------------------------------------------------------------------
/u01/app/oracle/oradata/TEST/redo01.log
/u01/app/oracle/oradata/TEST/redo02.log
/u01/app/oracle/oradata/TEST/redo03.log
SQL> select name from v$tempfile;
NAME
------------------------------------------------------------
/u01/app/oracle/oradata/TEST/temp01.dbf
4.3.4 open数据库
SQL> alter database open resetlogs;
Database altered.
4.4 验证数据
SQL> select count(*) from scott.test2 ;
COUNT(*)
----------
157838
SQL> select count(*) from scott.test1 ;
select count(*) from scott.test1
*
ERROR at line 1:
ORA-00376: file 7 cannot be read at this time
ORA-01110: data file 7: '/u01/app/oracle/oradata/TEST/test02.dbf'
4.5 尝试删除datafile 7
SQL> alter tablespace test drop datafile '/u01/app/oracle/oradata/TEST/test02.dbf';
alter tablespace test drop datafile '/u01/app/oracle/oradata/TEST/test02.dbf'
*
ERROR at line 1:
ORA-03264: cannot drop offline datafile of locally managed tablespace
结论：datafile 7 删除报错，如果一定要处理的话，可以通过bbed的方式去修复后删除。
